ISTWCMS-3759: updating script to use correct package file

build_gesso.sh

@@ -9,8 +9,8 @@ if [ -f "gulpfile.js" ]; then
   cp gulpfile.js gesso
 fi
 
-if [ -f "packages.json" ]; then
-  cp packages.json gesso
+if [ -f "package.json" ]; then
+  cp package.json gesso
 fi
 
 ln -s "gesso/source" "source"